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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd005ab18956a9b14e9e95497df79638870a1c06d1d0fb9cbadce888ae37aa15' 
  AND token = 'jReoCrE37Z1GWA7fpk1pbN1hbQ5S23WNls19pbskOBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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