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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e4dafb09acd701feeca8333d839ff08e41558d950d702fba6fa43bc1134636' 
  AND token = '+T1ZWk2KUsONn0GKv+f346+CbfOzbxPqo95nk6o5ehY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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