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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e61880d1f4990105f77227ef76a85597265e43493cc9d2d436509cc64248e46' 
  AND token = '+CFynoGg99KCjonF4F20Vr2Tlzrrrre/LJbe1NLPANk=' 
  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"
    }
  }
}