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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b981e06a14c3c9530e5ded788a731d93cf174bb24f339b69e95d668fd624c917' 
  AND token = '3Q1cba+jTj8eoPG12J/0u8DJ9WPyVjEva88Dd+22yw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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