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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950a50ebe0f4b412043fb8421ee7c367ed858d7fb29d602e8981319f120ac993' 
  AND token = '7Ou6Cl62Kjhl+4EoTfHQ2vaWT/0CJETspiRle2Ckmxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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