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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5ac9196f478e8ea744dbe1117041b203da7f35ecc214ee188c6c8777790b0b' 
  AND token = '0X+RI0cpbcryREftVXpO6v6rEuyL2XE1WBACUyF9CeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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