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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f101e2ad4df23af0e17a8207bc1bfe2e0a67287539cb158a905c04672f8525f4' 
  AND token = 'Jgi0Njupfi9o3yU0sov+Stz/pxs4Bejvzmoqi9CM328=' 
  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"
    }
  }
}