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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2b4bff9dd69d387625a2587b3c8805d9a3ea4f0114e450a0b71ea808c7ad31' 
  AND token = 'BqSiYdgHNj4S4STIgLlJ4CzVpINC02NtQoJmx3UhCPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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