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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a12a11a56fba6dc82a763a49e17e3f963384dc815eb0dca49bbf7296ed83643' 
  AND token = 'h090BmnrvPx4NnCG/SdaBgykdlJj8p6XlHs7gd0nr8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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