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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234ccd95e1dffd2dfa0193f19e8bfe0574b4ca744fbc3e2aebbb2aa2fd59fb42' 
  AND token = 'mwW+mxINe0E7q4VsCeNEfl2oGGR2FVKjT8CVcu5Fw+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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