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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4e37e896e6400a194c1d49e2ddf26f784942f2590b19cb217804b2466c4424' 
  AND token = 'W8ky9HnlbDTer3pQljqY8/ZIDnbTbGEJeQ8ENzzNaBU=' 
  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"
    }
  }
}