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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6720cce1ae1faf1e9340c09380ff14ac5699051170c9a7614f91a16f789a6a58' 
  AND token = 'musqUJPEQDENEAIUq4DC0MIvCDfi9Q7QkB/3tpmNKa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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