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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f357c508c581cd2ae164e7fc05a97bed4602b41a8d205a924d1f625f0ec291f3' 
  AND token = 'kXTm9AojLKvb4kO6IMDSBrR8v3f+Ew+5Rg31o1CJneo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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