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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a0df31dcde8c5a2927875d01bce77f7f7b2c9a30e4540b3156745006f3d0a8' 
  AND token = 'Gyf9QDEj/zTtQ4/J2iPX/H9GzQFjD+6OCSofPd09QUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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