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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f82c82fdfe89fda39f6fb10666add832ab483b226c8b5820ed76a7eb223c9b' 
  AND token = 'joYl5C1NkD8YDVzqg9ZQDmfVZT3I/rEEAmv+6oZVsVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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