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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc486ca1a9e29400c244bd45e26b748a44228a384959fd3a624c0c4363de8ca6' 
  AND token = 'V6A/IYwms4ntPnLXp+UDYYd1VThLDpUfkMjdeXciG3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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