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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929bbe7c88223df2fc035d78f54000780072c70792e8f57612c0e138829b78ca' 
  AND token = 'ks7NeNkWMXGyFvDeoQphvaXr1OpxzEWOiCgE+CmpsEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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