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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8961dd4b956a65815e22de8051ffecf0708e9c2ab145e5c7f7018cab243b6ff' 
  AND token = '846K8sESqwSkhypvpiD7mHCLJCWRC1x/5AzX8rIzpRE=' 
  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"
    }
  }
}