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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44f96232323e5a57022e6a6e560f51e4956e8d112ea7da9f403f27d1ffa5902' 
  AND token = '4ovVFj1X/g8Wx4rH0GHo85UzcwU+ciG/2t1e2OrCiuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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