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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd483f8fb5bc35a9d27da13e9724abb86bda8a4db61db84e256a7d5d164beb7fb' 
  AND token = '16j6S//tLxxG2GFASEjyvgRE1GhuSGE+F6whneMGPuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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