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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe4ba2ec66ac648eba4696588d880ff99e5e0ba05c68887f720212db5b7605d' 
  AND token = 'cb+Y5g4JSpEr4byGh3RNoivg9A8f+XVyftKCbTMIP2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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