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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad5de04c1761d272a856dd6942db17131ca136b2aafa63797de8b62a2b8dcad' 
  AND token = 'w7woRqFzXaM1Chh5BkmQh2VY9Advgw4ozJuu0fkG0Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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