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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4977052960138ffe8f2b7ea93d8034a79c3bc10b5f830ec3936c5f197f8b083d' 
  AND token = 'brskmSbe2tO4D5okrd/04l2t8w6a9G93cheoSNsIdck=' 
  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"
    }
  }
}