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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e662f690e4c425b92cd0749e1a1cd4365c08f5aa72b5d8e456bfe037b37a2132' 
  AND token = 'eN9qdlS9xkxWsiQc8EB5y85eKU02THgt0PpDo8/qR+o=' 
  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"
    }
  }
}