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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f837bd9950f4d84e109b8a01a170436f4135400c710cd91392d818f0e58d6bfb' 
  AND token = '54Jdf/P99y/NBCw+5x33I3b9nQerui5059jFSBFCaYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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