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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8214e6ceea57e07a773f9cb3b2e915597cee009e72619b3713c9e7555a896c' 
  AND token = 'gZYVydF7iN0Lh+Ob5y9xWtT+A2fN00/UJDYC1ydrJfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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