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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a5717d503153828f7eb2e1fff3652fb083301aa5aac54b46f1feb449d3e381' 
  AND token = 'z7noySW0R9WrXvHHWP57AhQNBRbllg8BOvt+KC8f/Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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