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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1094fe775076633036fe8b052459aaff94215a961e90abe07b122c1212c9d7' 
  AND token = 'bSSCW6TWl2/f0g96/ywEg1YKiPMfXwhkk4DzjTZsLVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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