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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7d44aa4a431863a1a23e01dff9636e73e7073ec14f37fc0b6ceea1478921be' 
  AND token = '8Ldx5HnCSEOZlot+Jwo9XCsJ54ajogKTTjmYlXurcKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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