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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b64b97620d5f24f7f6e7a47e494489b02680db4f4688a4aed82176075c96a5' 
  AND token = 'OG04K6vfLG4ARfJ8mku3nBzRJufFgv8RfM1h37qrfaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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