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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a364066cc4d4106979a88f9abe08c54c2a27c1cfe50f8ea94226187351dc0186' 
  AND token = 'CRTQTH6PrZGttizXG0ihaUHd5Ks/I0cqo0WAWPkcDus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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