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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac623e0703ffc1d94651579494f9d4d4ee328ea8f6c932b153ec3a0f89f1288' 
  AND token = 'qJdut0ql098Nx26o9qLCwtWm3kL48kGAS1s18yK0DYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}