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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d49af2dc8ca8a96af3efda183d44dc3c68f9e42868371ca01d4b4c927dd2c1' 
  AND token = 'EbqvFSYUSOaM21G9YEgY3GuCXs+vqmSD64udxWc8mdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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