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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d6de3e6656e49b70f58015c594b89b7a5c4ae79dd11037ed5fa5af9a37a635' 
  AND token = 'gFq8eyshMGrf29lDf2LxrGGfzc3kJ9YwpA9FCyNwKpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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