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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49a0d1a511a6b7ae511cc3f750c0662ecc9f04247f8f6af9b6ebebe9bf46a92' 
  AND token = 'zBNQxdeUsKn2Xe6+2BokwJ3+v2ci9pjALaYQPIAdpkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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