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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b422abd543412b26511654bb66bc7381754ca296cc834e025d0cce376043d77a' 
  AND token = '7Cv3cTkSVYK/zwY8msN8eTrZpD7tA6UZgUOoFDiZrWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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