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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cd6d2d68c6f2d1bbdf75b3580fbbcaa5e7b950cb9ce5c31867743cab0db4f9' 
  AND token = 'cwC16bbfL58cAN7DfJaAB1Q5jYs24AP2a9PSzOYGFSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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