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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ca2520d68c36f65e98589e53fe8746f40b398df4d2a22e32ae9e5a660db74e' 
  AND token = 'EKtzbjJ+zBoFwg3ceoO8zxCeQZm29SkUiyLOE0YxqaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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