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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf3fd6e7de8f522094734c92e70e45e93f697dabc0bc6460c97e020b3e33a08' 
  AND token = '91r/s9MooPJuh+NLccEm9eo7CpLpY7J+mkkzkIwMiac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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