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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f7f19a681cdd167af524c292f5c88e913a8e42c9f6b506ffbc86bd89c04470' 
  AND token = 'rYymNT9QKxLJM2hCrKgd4grpIW8p/66+GKuxHb0P6LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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