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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae50e384579dd5264141ba00c89a10800f8b67fca015c01aa3eb7e3b375044d1' 
  AND token = 'Xy5JdkaLN7yF/p3I8wRaHk/mHwt4OEKusAkDrnwpLwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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