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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28ebf40a54d995191f7077e62b8ffee7b9171742bfc1ae94e933494e3fcb557' 
  AND token = 'F5hBm0h5KZpvQ7gkVSReFYu3QXZT3NI5uDwCNFtBOBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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