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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a6d47b1eb485cf58c74fc46e091140f3c7e43cfead5781dbbb501b057b29c9' 
  AND token = 'Lj4Qq+39U5dmCCrQEYOJ5T624cymNyy8TpQkAvaVOek=' 
  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"
    }
  }
}