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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07d7b2e2cc96c7fb3e5e3bbe0e560138b72030459a37f7ad41c603e2d9c65ab' 
  AND token = '91qduVsEvd5kyTyz0jHrJRvNSVtSB12LU8pd6pwWQ1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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