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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a84b46a3cf63bd67cb8f98e80676dfaa1ac60620872896c9eab98487ee6b69' 
  AND token = 'mcKLgtSuVBGEbULRh7ETYhwCKJK2s9lBsD6CMRL2Hhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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