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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa2b99f6200796775b38e85bd0e8477a14f21363fef765c0c44795f8dd9a71e' 
  AND token = '+a7PLUx54EllJcM9I3eE57rMvV9DT1taCkHL0lf/0b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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