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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f82c0cf07664ea28a76889bc595043434bb7bc9b4c415681c1b6f35a9da7230' 
  AND token = 'Van98ecgiTRWewTeVTeLqciSPCgV/cBGsflqNzH3YSY=' 
  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"
    }
  }
}