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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956d0ae4a572a8ff7d2221177ad863c664e985082702ea13dc17328aab625fc9' 
  AND token = '5fgVD3uvuAaC2zWeaSaFLtXLnx57FgaSJHmnvvgOOQE=' 
  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"
    }
  }
}