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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afb20b35aaf65ef191235477d069fcf50cad33d0b3b76065737afa884e9e98b' 
  AND token = '5RZC4gfIDQFV1t1rLhtdtg0+D7bW37SdxpcNZ9qPx00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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